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Edit File : RFC822.php \| Size : 30.89 KB
<?php /** * RFC 822 Email address list validation Utility * * PHP version 5 * * LICENSE: * * Copyright (c) 2001-2017, Chuck Hagenbuch & Richard Heyes * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 3. Neither the name of the copyright holder nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * @category Mail * @package Mail * @author Richard Heyes <richard@phpguru.org> * @author Chuck Hagenbuch <chuck@horde.org * @copyright 2001-2017 Richard Heyes * @license http://opensource.org/licenses/BSD-3-Clause New BSD License * @version CVS: $Id$ * @link http://pear.php.net/package/Mail/ / /* * RFC 822 Email address list validation Utility * * What is it? * * This class will take an address string, and parse it into it's consituent * parts, be that either addresses, groups, or combinations. Nested groups * are not supported. The structure it returns is pretty straight forward, * and is similar to that provided by the imap_rfc822_parse_adrlist(). Use * print_r() to view the structure. * * How do I use it? * * $address_string = 'My Group: "Richard" <richard@localhost> (A comment), ted@example.com (Ted Bloggs), Barney;'; * $structure = Mail_RFC822::parseAddressList($address_string, 'example.com', true) * print_r($structure); * * @author Richard Heyes <richard@phpguru.org> * @author Chuck Hagenbuch <chuck@horde.org> * @version $Revision$ * @license BSD * @package Mail / class Mail_RFC822 { /* * The address being parsed by the RFC822 object. * @var string $address / var $address = ''; /* * The default domain to use for unqualified addresses. * @var string $default_domain / var $default_domain = 'localhost'; /* * Should we return a nested array showing groups, or flatten everything? * @var boolean $nestGroups / var $nestGroups = true; /* * Whether or not to validate atoms for non-ascii characters. * @var boolean $validate / var $validate = true; /* * The array of raw addresses built up as we parse. * @var array $addresses / var $addresses = array(); /* * The final array of parsed address information that we build up. * @var array $structure / var $structure = array(); /* * The current error message, if any. * @var string $error / var $error = null; /* * An internal counter/pointer. * @var integer $index / var $index = null; /* * The number of groups that have been found in the address list. * @var integer $num_groups * @access public / var $num_groups = 0; /* * A variable so that we can tell whether or not we're inside a * Mail_RFC822 object. * @var boolean $mailRFC822 / var $mailRFC822 = true; /* * A limit after which processing stops * @var int $limit / var $limit = null; /* * Sets up the object. The address must either be set here or when * calling parseAddressList(). One or the other. * * @param string $address The address(es) to validate. * @param string $default_domain Default domain/host etc. If not supplied, will be set to localhost. * @param boolean $nest_groups Whether to return the structure with groups nested for easier viewing. * @param boolean $validate Whether to validate atoms. Turn this off if you need to run addresses through before encoding the personal names, for instance. * * @return object Mail_RFC822 A new Mail_RFC822 object. / public function __construct($address = null, $default_domain = null, $nest_groups = null, $validate = null, $limit = null) { if (isset($address)) $this->address = $address; if (isset($default_domain)) $this->default_domain = $default_domain; if (isset($nest_groups)) $this->nestGroups = $nest_groups; if (isset($validate)) $this->validate = $validate; if (isset($limit)) $this->limit = $limit; } /* * Starts the whole process. The address must either be set here * or when creating the object. One or the other. * * @param string $address The address(es) to validate. * @param string $default_domain Default domain/host etc. * @param boolean $nest_groups Whether to return the structure with groups nested for easier viewing. * @param boolean $validate Whether to validate atoms. Turn this off if you need to run addresses through before encoding the personal names, for instance. * * @return array A structured array of addresses. / public function parseAddressList($address = null, $default_domain = null, $nest_groups = null, $validate = null, $limit = null) { if (!isset($this) \|\| !isset($this->mailRFC822)) { $obj = new Mail_RFC822($address, $default_domain, $nest_groups, $validate, $limit); return $obj->parseAddressList(); } if (isset($address)) $this->address = $address; if (isset($default_domain)) $this->default_domain = $default_domain; if (isset($nest_groups)) $this->nestGroups = $nest_groups; if (isset($validate)) $this->validate = $validate; if (isset($limit)) $this->limit = $limit; $this->structure = array(); $this->addresses = array(); $this->error = null; $this->index = null; // Unfold any long lines in $this->address. $this->address = preg_replace('/\r?\n/', "\r\n", $this->address); $this->address = preg_replace('/\r\n(\t\| )+/', ' ', $this->address); while ($this->address = $this->_splitAddresses($this->address)); if ($this->address === false \|\| isset($this->error)) { require_once 'PEAR.php'; return PEAR::raiseError($this->error); } // Validate each address individually. If we encounter an invalid // address, stop iterating and return an error immediately. foreach ($this->addresses as $address) { $valid = $this->_validateAddress($address); if ($valid === false \|\| isset($this->error)) { require_once 'PEAR.php'; return PEAR::raiseError($this->error); } if (!$this->nestGroups) { $this->structure = array_merge($this->structure, $valid); } else { $this->structure[] = $valid; } } return $this->structure; } /* * Splits an address into separate addresses. * * @param string $address The addresses to split. * @return boolean Success or failure. / protected function _splitAddresses($address) { if (!empty($this->limit) && count($this->addresses) == $this->limit) { return ''; } if ($this->_isGroup($address) && !isset($this->error)) { $split_char = ';'; $is_group = true; } elseif (!isset($this->error)) { $split_char = ','; $is_group = false; } elseif (isset($this->error)) { return false; } // Split the string based on the above ten or so lines. $parts = explode($split_char, $address); $string = $this->_splitCheck($parts, $split_char); // If a group... if ($is_group) { // If $string does not contain a colon outside of // brackets/quotes etc then something's fubar. // First check there's a colon at all: if (strpos($string, ':') === false) { $this->error = 'Invalid address: ' . $string; return false; } // Now check it's outside of brackets/quotes: if (!$this->_splitCheck(explode(':', $string), ':')) { return false; } // We must have a group at this point, so increase the counter: $this->num_groups++; } // $string now contains the first full address/group. // Add to the addresses array. $this->addresses[] = array( 'address' => trim($string), 'group' => $is_group ); // Remove the now stored address from the initial line, the +1 // is to account for the explode character. $address = trim(substr($address, strlen($string) + 1)); // If the next char is a comma and this was a group, then // there are more addresses, otherwise, if there are any more // chars, then there is another address. if ($is_group && substr($address, 0, 1) == ','){ $address = trim(substr($address, 1)); return $address; } elseif (strlen($address) > 0) { return $address; } else { return ''; } // If you got here then something's off return false; } /* * Checks for a group at the start of the string. * * @param string $address The address to check. * @return boolean Whether or not there is a group at the start of the string. / protected function _isGroup($address) { // First comma not in quotes, angles or escaped: $parts = explode(',', $address); $string = $this->_splitCheck($parts, ','); // Now we have the first address, we can reliably check for a // group by searching for a colon that's not escaped or in // quotes or angle brackets. if (count($parts = explode(':', $string)) > 1) { $string2 = $this->_splitCheck($parts, ':'); return ($string2 !== $string); } else { return false; } } /* * A common function that will check an exploded string. * * @param array $parts The exloded string. * @param string $char The char that was exploded on. * @return mixed False if the string contains unclosed quotes/brackets, or the string on success. / protected function _splitCheck($parts, $char) { $string = $parts[0]; for ($i = 0; $i < count($parts); $i++) { if ($this->_hasUnclosedQuotes($string) \|\| $this->_hasUnclosedBrackets($string, '<>') \|\| $this->_hasUnclosedBrackets($string, '[]') \|\| $this->_hasUnclosedBrackets($string, '()') \|\| substr($string, -1) == '\\') { if (isset($parts[$i + 1])) { $string = $string . $char . $parts[$i + 1]; } else { $this->error = 'Invalid address spec. Unclosed bracket or quotes'; return false; } } else { $this->index = $i; break; } } return $string; } /* * Checks if a string has unclosed quotes or not. * * @param string $string The string to check. * @return boolean True if there are unclosed quotes inside the string, * false otherwise. / protected function _hasUnclosedQuotes($string) { $string = trim($string); $iMax = strlen($string); $in_quote = false; $i = $slashes = 0; for (; $i < $iMax; ++$i) { switch ($string[$i]) { case '\\': ++$slashes; break; case '"': if ($slashes % 2 == 0) { $in_quote = !$in_quote; } // Fall through to default action below. default: $slashes = 0; break; } } return $in_quote; } /* * Checks if a string has an unclosed brackets or not. IMPORTANT: * This function handles both angle brackets and square brackets; * * @param string $string The string to check. * @param string $chars The characters to check for. * @return boolean True if there are unclosed brackets inside the string, false otherwise. / protected function _hasUnclosedBrackets($string, $chars) { $num_angle_start = substr_count($string, $chars[0]); $num_angle_end = substr_count($string, $chars[1]); $this->_hasUnclosedBracketsSub($string, $num_angle_start, $chars[0]); $this->_hasUnclosedBracketsSub($string, $num_angle_end, $chars[1]); if ($num_angle_start < $num_angle_end) { $this->error = 'Invalid address spec. Unmatched quote or bracket (' . $chars . ')'; return false; } else { return ($num_angle_start > $num_angle_end); } } /* * Sub function that is used only by hasUnclosedBrackets(). * * @param string $string The string to check. * @param integer &$num The number of occurences. * @param string $char The character to count. * @return integer The number of occurences of $char in $string, adjusted for backslashes. / protected function _hasUnclosedBracketsSub($string, &$num, $char) { $parts = explode($char, $string); for ($i = 0; $i < count($parts); $i++){ if (substr($parts[$i], -1) == '\\' \|\| $this->_hasUnclosedQuotes($parts[$i])) $num--; if (isset($parts[$i + 1])) $parts[$i + 1] = $parts[$i] . $char . $parts[$i + 1]; } return $num; } /* * Function to begin checking the address. * * @param string $address The address to validate. * @return mixed False on failure, or a structured array of address information on success. / protected function _validateAddress($address) { $is_group = false; $addresses = array(); if ($address['group']) { $is_group = true; // Get the group part of the name $parts = explode(':', $address['address']); $groupname = $this->_splitCheck($parts, ':'); $structure = array(); // And validate the group part of the name. if (!$this->_validatePhrase($groupname)){ $this->error = 'Group name did not validate.'; return false; } else { // Don't include groups if we are not nesting // them. This avoids returning invalid addresses. if ($this->nestGroups) { $structure = new stdClass; $structure->groupname = $groupname; } } $address['address'] = ltrim(substr($address['address'], strlen($groupname . ':'))); } // If a group then split on comma and put into an array. // Otherwise, Just put the whole address in an array. if ($is_group) { while (strlen($address['address']) > 0) { $parts = explode(',', $address['address']); $addresses[] = $this->_splitCheck($parts, ','); $address['address'] = trim(substr($address['address'], strlen(end($addresses) . ','))); } } else { $addresses[] = $address['address']; } // Trim the whitespace from all of the address strings. array_map('trim', $addresses); // Validate each mailbox. // Format could be one of: name <geezer@domain.com> // geezer@domain.com // geezer // ... or any other format valid by RFC 822. for ($i = 0; $i < count($addresses); $i++) { if (!$this->validateMailbox($addresses[$i])) { if (empty($this->error)) { $this->error = 'Validation failed for: ' . $addresses[$i]; } return false; } } // Nested format if ($this->nestGroups) { if ($is_group) { $structure->addresses = $addresses; } else { $structure = $addresses[0]; } // Flat format } else { if ($is_group) { $structure = array_merge($structure, $addresses); } else { $structure = $addresses; } } return $structure; } /* * Function to validate a phrase. * * @param string $phrase The phrase to check. * @return boolean Success or failure. / protected function _validatePhrase($phrase) { // Splits on one or more Tab or space. $parts = preg_split('/[ \\x09]+/', $phrase, -1, PREG_SPLIT_NO_EMPTY); $phrase_parts = array(); while (count($parts) > 0){ $phrase_parts[] = $this->_splitCheck($parts, ' '); for ($i = 0; $i < $this->index + 1; $i++) array_shift($parts); } foreach ($phrase_parts as $part) { // If quoted string: if (substr($part, 0, 1) == '"') { if (!$this->_validateQuotedString($part)) { return false; } continue; } // Otherwise it's an atom: if (!$this->_validateAtom($part)) return false; } return true; } /* * Function to validate an atom which from rfc822 is: * atom = 1<any CHAR except specials, SPACE and CTLs> * If validation ($this->validate) has been turned off, then * validateAtom() doesn't actually check anything. This is so that you * can split a list of addresses up before encoding personal names * (umlauts, etc.), for example. * * @param string $atom The string to check. * @return boolean Success or failure. / protected function _validateAtom($atom) { if (!$this->validate) { // Validation has been turned off; assume the atom is okay. return true; } // Check for any char from ASCII 0 - ASCII 127 if (!preg_match('/^[\\x00-\\x7E]+$/i', $atom, $matches)) { return false; } // Check for specials: if (preg_match('/[][()<>@,;\\:". ]/', $atom)) { return false; } // Check for control characters (ASCII 0-31): if (preg_match('/[\\x00-\\x1F]+/', $atom)) { return false; } return true; } /* * Function to validate quoted string, which is: * quoted-string = <"> (qtext/quoted-pair) <"> * @param string $qstring The string to check * @return boolean Success or failure. / protected function _validateQuotedString($qstring) { // Leading and trailing " $qstring = substr($qstring, 1, -1); // Perform check, removing quoted characters first. return !preg_match('/[\x0D\\\\"]/', preg_replace('/\\\\./', '', $qstring)); } /* * Function to validate a mailbox, which is: * mailbox = addr-spec ; simple address * / phrase route-addr ; name and route-addr * * @param string &$mailbox The string to check. * @return boolean Success or failure. / public function validateMailbox(&$mailbox) { // A couple of defaults. $phrase = ''; $comment = ''; $comments = array(); // Catch any RFC822 comments and store them separately. $_mailbox = $mailbox; while (strlen(trim($_mailbox)) > 0) { $parts = explode('(', $_mailbox); $before_comment = $this->_splitCheck($parts, '('); if ($before_comment != $_mailbox) { // First char should be a (. $comment = substr(str_replace($before_comment, '', $_mailbox), 1); $parts = explode(')', $comment); $comment = $this->_splitCheck($parts, ')'); $comments[] = $comment; // +2 is for the brackets $_mailbox = substr($_mailbox, strpos($_mailbox, '('.$comment)+strlen($comment)+2); } else { break; } } foreach ($comments as $comment) { $mailbox = str_replace("($comment)", '', $mailbox); } $mailbox = trim($mailbox); // Check for name + route-addr if (substr($mailbox, -1) == '>' && substr($mailbox, 0, 1) != '<') { $parts = explode('<', $mailbox); $name = $this->_splitCheck($parts, '<'); $phrase = trim($name); $route_addr = trim(substr($mailbox, strlen($name.'<'), -1)); if ($this->_validatePhrase($phrase) === false \|\| ($route_addr = $this->_validateRouteAddr($route_addr)) === false) { return false; } // Only got addr-spec } else { // First snip angle brackets if present. if (substr($mailbox, 0, 1) == '<' && substr($mailbox, -1) == '>') { $addr_spec = substr($mailbox, 1, -1); } else { $addr_spec = $mailbox; } if (($addr_spec = $this->_validateAddrSpec($addr_spec)) === false) { return false; } } // Construct the object that will be returned. $mbox = new stdClass(); // Add the phrase (even if empty) and comments $mbox->personal = $phrase; $mbox->comment = isset($comments) ? $comments : array(); if (isset($route_addr)) { $mbox->mailbox = $route_addr['local_part']; $mbox->host = $route_addr['domain']; $route_addr['adl'] !== '' ? $mbox->adl = $route_addr['adl'] : ''; } else { $mbox->mailbox = $addr_spec['local_part']; $mbox->host = $addr_spec['domain']; } $mailbox = $mbox; return true; } /* * This function validates a route-addr which is: * route-addr = "<" [route] addr-spec ">" * * Angle brackets have already been removed at the point of * getting to this function. * * @param string $route_addr The string to check. * @return mixed False on failure, or an array containing validated address/route information on success. / protected function _validateRouteAddr($route_addr) { // Check for colon. if (strpos($route_addr, ':') !== false) { $parts = explode(':', $route_addr); $route = $this->_splitCheck($parts, ':'); } else { $route = $route_addr; } // If $route is same as $route_addr then the colon was in // quotes or brackets or, of course, non existent. if ($route === $route_addr){ unset($route); $addr_spec = $route_addr; if (($addr_spec = $this->_validateAddrSpec($addr_spec)) === false) { return false; } } else { // Validate route part. if (($route = $this->_validateRoute($route)) === false) { return false; } $addr_spec = substr($route_addr, strlen($route . ':')); // Validate addr-spec part. if (($addr_spec = $this->_validateAddrSpec($addr_spec)) === false) { return false; } } if (isset($route)) { $return['adl'] = $route; } else { $return['adl'] = ''; } $return = array_merge($return, $addr_spec); return $return; } /* * Function to validate a route, which is: * route = 1#("@" domain) ":" * * @param string $route The string to check. * @return mixed False on failure, or the validated $route on success. / protected function _validateRoute($route) { // Split on comma. $domains = explode(',', trim($route)); foreach ($domains as $domain) { $domain = str_replace('@', '', trim($domain)); if (!$this->_validateDomain($domain)) return false; } return $route; } /* * Function to validate a domain, though this is not quite what * you expect of a strict internet domain. * * domain = sub-domain ("." sub-domain) * @param string $domain The string to check. * @return mixed False on failure, or the validated domain on success. / protected function _validateDomain($domain) { // Note the different use of $subdomains and $sub_domains $subdomains = explode('.', $domain); while (count($subdomains) > 0) { $sub_domains[] = $this->_splitCheck($subdomains, '.'); for ($i = 0; $i < $this->index + 1; $i++) array_shift($subdomains); } foreach ($sub_domains as $sub_domain) { if (!$this->_validateSubdomain(trim($sub_domain))) return false; } // Managed to get here, so return input. return $domain; } /* * Function to validate a subdomain: * subdomain = domain-ref / domain-literal * * @param string $subdomain The string to check. * @return boolean Success or failure. / protected function _validateSubdomain($subdomain) { if (preg_match('\|^\[(.)]$\|', $subdomain, $arr)){ if (!$this->_validateDliteral($arr[1])) return false; } else { if (!$this->_validateAtom($subdomain)) return false; } // Got here, so return successful. return true; } /** * Function to validate a domain literal: * domain-literal = "[" (dtext / quoted-pair) "]" * @param string $dliteral The string to check. * @return boolean Success or failure. / protected function _validateDliteral($dliteral) { return !preg_match('/(.)[][\x0D\\\\]/', $dliteral, $matches) && ((! isset($matches[1])) \|\| $matches[1] != '\\'); } /* * Function to validate an addr-spec. * * addr-spec = local-part "@" domain * * @param string $addr_spec The string to check. * @return mixed False on failure, or the validated addr-spec on success. / protected function _validateAddrSpec($addr_spec) { $addr_spec = trim($addr_spec); // Split on @ sign if there is one. if (strpos($addr_spec, '@') !== false) { $parts = explode('@', $addr_spec); $local_part = $this->_splitCheck($parts, '@'); $domain = substr($addr_spec, strlen($local_part . '@')); // No @ sign so assume the default domain. } else { $local_part = $addr_spec; $domain = $this->default_domain; } if (($local_part = $this->_validateLocalPart($local_part)) === false) return false; if (($domain = $this->_validateDomain($domain)) === false) return false; // Got here so return successful. return array('local_part' => $local_part, 'domain' => $domain); } /* * Function to validate the local part of an address: * local-part = word ("." word) * @param string $local_part * @return mixed False on failure, or the validated local part on success. / protected function _validateLocalPart($local_part) { $parts = explode('.', $local_part); $words = array(); // Split the local_part into words. while (count($parts) > 0) { $words[] = $this->_splitCheck($parts, '.'); for ($i = 0; $i < $this->index + 1; $i++) { array_shift($parts); } } // Validate each word. foreach ($words as $word) { // word cannot be empty (#17317) if ($word === '') { return false; } // If this word contains an unquoted space, it is invalid. (6.2.4) if (strpos($word, ' ') && $word[0] !== '"') { return false; } if ($this->_validatePhrase(trim($word)) === false) return false; } // Managed to get here, so return the input. return $local_part; } /* * Returns an approximate count of how many addresses are in the * given string. This is APPROXIMATE as it only splits based on a * comma which has no preceding backslash. Could be useful as * large amounts of addresses will end up producing large * structures when used with parseAddressList(). * * @param string $data Addresses to count * @return int Approximate count / public function approximateCount($data) { return count(preg_split('/(?<!\\\\),/', $data)); } /* * This is a email validating function separate to the rest of the * class. It simply validates whether an email is of the common * internet form: <user>@<domain>. This can be sufficient for most * people. Optional stricter mode can be utilised which restricts * mailbox characters allowed to alphanumeric, full stop, hyphen * and underscore. * * @param string $data Address to check * @param boolean $strict Optional stricter mode * @return mixed False if it fails, an indexed array * username/domain if it matches / public function isValidInetAddress($data, $strict = false) { $regex = $strict ? '/^([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})$/i' : '/^([+!.&#$\|\'\\%\/0-9a-z^_`{}=?~:-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})$/i'; if (preg_match($regex, trim($data), $matches)) { return array($matches[1], $matches[2]); } else { return false; } } } Back

Edit File : RFC822.php | Size : 30.89 KB

<?php
/**
 * RFC 822 Email address list validation Utility
 *
 * PHP version 5
 *
 * LICENSE:
 *
 * Copyright (c) 2001-2017, Chuck Hagenbuch & Richard Heyes
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @category    Mail
 * @package     Mail
 * @author      Richard Heyes <richard@phpguru.org>
 * @author      Chuck Hagenbuch <chuck@horde.org
 * @copyright   2001-2017 Richard Heyes
 * @license     http://opensource.org/licenses/BSD-3-Clause New BSD License
 * @version     CVS: $Id$
 * @link        http://pear.php.net/package/Mail/
 */

/**
 * RFC 822 Email address list validation Utility
 *
 * What is it?
 *
 * This class will take an address string, and parse it into it's consituent
 * parts, be that either addresses, groups, or combinations. Nested groups
 * are not supported. The structure it returns is pretty straight forward,
 * and is similar to that provided by the imap_rfc822_parse_adrlist(). Use
 * print_r() to view the structure.
 *
 * How do I use it?
 *
 * $address_string = 'My Group: "Richard" <richard@localhost> (A comment), ted@example.com (Ted Bloggs), Barney;';
 * $structure = Mail_RFC822::parseAddressList($address_string, 'example.com', true)
 * print_r($structure);
 *
 * @author  Richard Heyes <richard@phpguru.org>
 * @author  Chuck Hagenbuch <chuck@horde.org>
 * @version $Revision$
 * @license BSD
 * @package Mail
 */
class Mail_RFC822 {

/**
     * The address being parsed by the RFC822 object.
     * @var string $address
     */
    var $address = '';

/**
     * The default domain to use for unqualified addresses.
     * @var string $default_domain
     */
    var $default_domain = 'localhost';

/**
     * Should we return a nested array showing groups, or flatten everything?
     * @var boolean $nestGroups
     */
    var $nestGroups = true;

/**
     * Whether or not to validate atoms for non-ascii characters.
     * @var boolean $validate
     */
    var $validate = true;

/**
     * The array of raw addresses built up as we parse.
     * @var array $addresses
     */
    var $addresses = array();

/**
     * The final array of parsed address information that we build up.
     * @var array $structure
     */
    var $structure = array();

/**
     * The current error message, if any.
     * @var string $error
     */
    var $error = null;

/**
     * An internal counter/pointer.
     * @var integer $index
     */
    var $index = null;

/**
     * The number of groups that have been found in the address list.
     * @var integer $num_groups
     * @access public
     */
    var $num_groups = 0;

/**
     * A variable so that we can tell whether or not we're inside a
     * Mail_RFC822 object.
     * @var boolean $mailRFC822
     */
    var $mailRFC822 = true;

/**
    * A limit after which processing stops
    * @var int $limit
    */
    var $limit = null;

/**
     * Sets up the object. The address must either be set here or when
     * calling parseAddressList(). One or the other.
     *
     * @param string  $address         The address(es) to validate.
     * @param string  $default_domain  Default domain/host etc. If not supplied, will be set to localhost.
     * @param boolean $nest_groups     Whether to return the structure with groups nested for easier viewing.
     * @param boolean $validate        Whether to validate atoms. Turn this off if you need to run addresses through before encoding the personal names, for instance.
     *
     * @return object Mail_RFC822 A new Mail_RFC822 object.
     */
    public function __construct($address = null, $default_domain = null, $nest_groups = null, $validate = null, $limit = null)
    {
        if (isset($address))        $this->address        = $address;
        if (isset($default_domain)) $this->default_domain = $default_domain;
        if (isset($nest_groups))    $this->nestGroups     = $nest_groups;
        if (isset($validate))       $this->validate       = $validate;
        if (isset($limit))          $this->limit          = $limit;
    }

/**
     * Starts the whole process. The address must either be set here
     * or when creating the object. One or the other.
     *
     * @param string  $address         The address(es) to validate.
     * @param string  $default_domain  Default domain/host etc.
     * @param boolean $nest_groups     Whether to return the structure with groups nested for easier viewing.
     * @param boolean $validate        Whether to validate atoms. Turn this off if you need to run addresses through before encoding the personal names, for instance.
     *
     * @return array A structured array of addresses.
     */
    public function parseAddressList($address = null, $default_domain = null, $nest_groups = null, $validate = null, $limit = null)
    {
        if (!isset($this) || !isset($this->mailRFC822)) {
            $obj = new Mail_RFC822($address, $default_domain, $nest_groups, $validate, $limit);
            return $obj->parseAddressList();
        }

if (isset($address))        $this->address        = $address;
        if (isset($default_domain)) $this->default_domain = $default_domain;
        if (isset($nest_groups))    $this->nestGroups     = $nest_groups;
        if (isset($validate))       $this->validate       = $validate;
        if (isset($limit))          $this->limit          = $limit;

$this->structure  = array();
        $this->addresses  = array();
        $this->error      = null;
        $this->index      = null;

// Unfold any long lines in $this->address.
        $this->address = preg_replace('/\r?\n/', "\r\n", $this->address);
        $this->address = preg_replace('/\r\n(\t| )+/', ' ', $this->address);

while ($this->address = $this->_splitAddresses($this->address));

if ($this->address === false || isset($this->error)) {
            require_once 'PEAR.php';
            return PEAR::raiseError($this->error);
        }

// Validate each address individually.  If we encounter an invalid
        // address, stop iterating and return an error immediately.
        foreach ($this->addresses as $address) {
            $valid = $this->_validateAddress($address);

if ($valid === false || isset($this->error)) {
                require_once 'PEAR.php';
                return PEAR::raiseError($this->error);
            }

if (!$this->nestGroups) {
                $this->structure = array_merge($this->structure, $valid);
            } else {
                $this->structure[] = $valid;
            }
        }

return $this->structure;
    }

/**
     * Splits an address into separate addresses.
     *
     * @param string $address The addresses to split.
     * @return boolean Success or failure.
     */
    protected function _splitAddresses($address)
    {
        if (!empty($this->limit) && count($this->addresses) == $this->limit) {
            return '';
        }

if ($this->_isGroup($address) && !isset($this->error)) {
            $split_char = ';';
            $is_group   = true;
        } elseif (!isset($this->error)) {
            $split_char = ',';
            $is_group   = false;
        } elseif (isset($this->error)) {
            return false;
        }

// Split the string based on the above ten or so lines.
        $parts  = explode($split_char, $address);
        $string = $this->_splitCheck($parts, $split_char);

// If a group...
        if ($is_group) {
            // If $string does not contain a colon outside of
            // brackets/quotes etc then something's fubar.

// First check there's a colon at all:
            if (strpos($string, ':') === false) {
                $this->error = 'Invalid address: ' . $string;
                return false;
            }

// Now check it's outside of brackets/quotes:
            if (!$this->_splitCheck(explode(':', $string), ':')) {
                return false;
            }

// We must have a group at this point, so increase the counter:
            $this->num_groups++;
        }

// $string now contains the first full address/group.
        // Add to the addresses array.
        $this->addresses[] = array(
                                   'address' => trim($string),
                                   'group'   => $is_group
                                   );

// Remove the now stored address from the initial line, the +1
        // is to account for the explode character.
        $address = trim(substr($address, strlen($string) + 1));

// If the next char is a comma and this was a group, then
        // there are more addresses, otherwise, if there are any more
        // chars, then there is another address.
        if ($is_group && substr($address, 0, 1) == ','){
            $address = trim(substr($address, 1));
            return $address;

} elseif (strlen($address) > 0) {
            return $address;

} else {
            return '';
        }

// If you got here then something's off
        return false;
    }

/**
     * Checks for a group at the start of the string.
     *
     * @param string $address The address to check.
     * @return boolean Whether or not there is a group at the start of the string.
     */
    protected function _isGroup($address)
    {
        // First comma not in quotes, angles or escaped:
        $parts  = explode(',', $address);
        $string = $this->_splitCheck($parts, ',');

// Now we have the first address, we can reliably check for a
        // group by searching for a colon that's not escaped or in
        // quotes or angle brackets.
        if (count($parts = explode(':', $string)) > 1) {
            $string2 = $this->_splitCheck($parts, ':');
            return ($string2 !== $string);
        } else {
            return false;
        }
    }

/**
     * A common function that will check an exploded string.
     *
     * @param array $parts The exloded string.
     * @param string $char  The char that was exploded on.
     * @return mixed False if the string contains unclosed quotes/brackets, or the string on success.
     */
    protected function _splitCheck($parts, $char)
    {
        $string = $parts[0];

for ($i = 0; $i < count($parts); $i++) {
            if ($this->_hasUnclosedQuotes($string)
                || $this->_hasUnclosedBrackets($string, '<>')
                || $this->_hasUnclosedBrackets($string, '[]')
                || $this->_hasUnclosedBrackets($string, '()')
                || substr($string, -1) == '\\') {
                if (isset($parts[$i + 1])) {
                    $string = $string . $char . $parts[$i + 1];
                } else {
                    $this->error = 'Invalid address spec. Unclosed bracket or quotes';
                    return false;
                }
            } else {
                $this->index = $i;
                break;
            }
        }

return $string;
    }

/**
     * Checks if a string has unclosed quotes or not.
     *
     * @param string $string  The string to check.
     * @return boolean  True if there are unclosed quotes inside the string,
     *                  false otherwise.
     */
    protected function _hasUnclosedQuotes($string)
    {
        $string = trim($string);
        $iMax = strlen($string);
        $in_quote = false;
        $i = $slashes = 0;

for (; $i < $iMax; ++$i) {
            switch ($string[$i]) {
            case '\\':
                ++$slashes;
                break;

case '"':
                if ($slashes % 2 == 0) {
                    $in_quote = !$in_quote;
                }
                // Fall through to default action below.

default:
                $slashes = 0;
                break;
            }
        }

return $in_quote;
    }

/**
     * Checks if a string has an unclosed brackets or not. IMPORTANT:
     * This function handles both angle brackets and square brackets;
     *
     * @param string $string The string to check.
     * @param string $chars  The characters to check for.
     * @return boolean True if there are unclosed brackets inside the string, false otherwise.
     */
    protected function _hasUnclosedBrackets($string, $chars)
    {
        $num_angle_start = substr_count($string, $chars[0]);
        $num_angle_end   = substr_count($string, $chars[1]);

$this->_hasUnclosedBracketsSub($string, $num_angle_start, $chars[0]);
        $this->_hasUnclosedBracketsSub($string, $num_angle_end, $chars[1]);

if ($num_angle_start < $num_angle_end) {
            $this->error = 'Invalid address spec. Unmatched quote or bracket (' . $chars . ')';
            return false;
        } else {
            return ($num_angle_start > $num_angle_end);
        }
    }

/**
     * Sub function that is used only by hasUnclosedBrackets().
     *
     * @param string $string The string to check.
     * @param integer &$num    The number of occurences.
     * @param string $char   The character to count.
     * @return integer The number of occurences of $char in $string, adjusted for backslashes.
     */
    protected function _hasUnclosedBracketsSub($string, &$num, $char)
    {
        $parts = explode($char, $string);
        for ($i = 0; $i < count($parts); $i++){
            if (substr($parts[$i], -1) == '\\' || $this->_hasUnclosedQuotes($parts[$i]))
                $num--;
            if (isset($parts[$i + 1]))
                $parts[$i + 1] = $parts[$i] . $char . $parts[$i + 1];
        }

return $num;
    }

/**
     * Function to begin checking the address.
     *
     * @param string $address The address to validate.
     * @return mixed False on failure, or a structured array of address information on success.
     */
    protected function _validateAddress($address)
    {
        $is_group = false;
        $addresses = array();

if ($address['group']) {
            $is_group = true;

// Get the group part of the name
            $parts     = explode(':', $address['address']);
            $groupname = $this->_splitCheck($parts, ':');
            $structure = array();

// And validate the group part of the name.
            if (!$this->_validatePhrase($groupname)){
                $this->error = 'Group name did not validate.';
                return false;
            } else {
                // Don't include groups if we are not nesting
                // them. This avoids returning invalid addresses.
                if ($this->nestGroups) {
                    $structure = new stdClass;
                    $structure->groupname = $groupname;
                }
            }

$address['address'] = ltrim(substr($address['address'], strlen($groupname . ':')));
        }

// If a group then split on comma and put into an array.
        // Otherwise, Just put the whole address in an array.
        if ($is_group) {
            while (strlen($address['address']) > 0) {
                $parts       = explode(',', $address['address']);
                $addresses[] = $this->_splitCheck($parts, ',');
                $address['address'] = trim(substr($address['address'], strlen(end($addresses) . ',')));
            }
        } else {
            $addresses[] = $address['address'];
        }

// Trim the whitespace from all of the address strings.
        array_map('trim', $addresses);

// Validate each mailbox.
        // Format could be one of: name <geezer@domain.com>
        //                         geezer@domain.com
        //                         geezer
        // ... or any other format valid by RFC 822.
        for ($i = 0; $i < count($addresses); $i++) {
            if (!$this->validateMailbox($addresses[$i])) {
                if (empty($this->error)) {
                    $this->error = 'Validation failed for: ' . $addresses[$i];
                }
                return false;
            }
        }

// Nested format
        if ($this->nestGroups) {
            if ($is_group) {
                $structure->addresses = $addresses;
            } else {
                $structure = $addresses[0];
            }

// Flat format
        } else {
            if ($is_group) {
                $structure = array_merge($structure, $addresses);
            } else {
                $structure = $addresses;
            }
        }

return $structure;
    }

/**
     * Function to validate a phrase.
     *
     * @param string $phrase The phrase to check.
     * @return boolean Success or failure.
     */
    protected function _validatePhrase($phrase)
    {
        // Splits on one or more Tab or space.
        $parts = preg_split('/[ \\x09]+/', $phrase, -1, PREG_SPLIT_NO_EMPTY);

$phrase_parts = array();
        while (count($parts) > 0){
            $phrase_parts[] = $this->_splitCheck($parts, ' ');
            for ($i = 0; $i < $this->index + 1; $i++)
                array_shift($parts);
        }

foreach ($phrase_parts as $part) {
            // If quoted string:
            if (substr($part, 0, 1) == '"') {
                if (!$this->_validateQuotedString($part)) {
                    return false;
                }
                continue;
            }

// Otherwise it's an atom:
            if (!$this->_validateAtom($part)) return false;
        }

return true;
    }

/**
     * Function to validate an atom which from rfc822 is:
     * atom = 1*<any CHAR except specials, SPACE and CTLs>
     *
     * If validation ($this->validate) has been turned off, then
     * validateAtom() doesn't actually check anything. This is so that you
     * can split a list of addresses up before encoding personal names
     * (umlauts, etc.), for example.
     *
     * @param string $atom The string to check.
     * @return boolean Success or failure.
     */
    protected function _validateAtom($atom)
    {
        if (!$this->validate) {
            // Validation has been turned off; assume the atom is okay.
            return true;
        }

// Check for any char from ASCII 0 - ASCII 127
        if (!preg_match('/^[\\x00-\\x7E]+$/i', $atom, $matches)) {
            return false;
        }

// Check for specials:
        if (preg_match('/[][()<>@,;\\:". ]/', $atom)) {
            return false;
        }

// Check for control characters (ASCII 0-31):
        if (preg_match('/[\\x00-\\x1F]+/', $atom)) {
            return false;
        }

return true;
    }

/**
     * Function to validate quoted string, which is:
     * quoted-string = <"> *(qtext/quoted-pair) <">
     *
     * @param string $qstring The string to check
     * @return boolean Success or failure.
     */
    protected function _validateQuotedString($qstring)
    {
        // Leading and trailing "
        $qstring = substr($qstring, 1, -1);

// Perform check, removing quoted characters first.
        return !preg_match('/[\x0D\\\\"]/', preg_replace('/\\\\./', '', $qstring));
    }

/**
     * Function to validate a mailbox, which is:
     * mailbox =   addr-spec         ; simple address
     *           / phrase route-addr ; name and route-addr
     *
     * @param string &$mailbox The string to check.
     * @return boolean Success or failure.
     */
    public function validateMailbox(&$mailbox)
    {
        // A couple of defaults.
        $phrase  = '';
        $comment = '';
        $comments = array();

// Catch any RFC822 comments and store them separately.
        $_mailbox = $mailbox;
        while (strlen(trim($_mailbox)) > 0) {
            $parts = explode('(', $_mailbox);
            $before_comment = $this->_splitCheck($parts, '(');
            if ($before_comment != $_mailbox) {
                // First char should be a (.
                $comment    = substr(str_replace($before_comment, '', $_mailbox), 1);
                $parts      = explode(')', $comment);
                $comment    = $this->_splitCheck($parts, ')');
                $comments[] = $comment;

// +2 is for the brackets
                $_mailbox = substr($_mailbox, strpos($_mailbox, '('.$comment)+strlen($comment)+2);
            } else {
                break;
            }
        }

foreach ($comments as $comment) {
            $mailbox = str_replace("($comment)", '', $mailbox);
        }

$mailbox = trim($mailbox);

// Check for name + route-addr
        if (substr($mailbox, -1) == '>' && substr($mailbox, 0, 1) != '<') {
            $parts  = explode('<', $mailbox);
            $name   = $this->_splitCheck($parts, '<');

$phrase     = trim($name);
            $route_addr = trim(substr($mailbox, strlen($name.'<'), -1));

if ($this->_validatePhrase($phrase) === false || ($route_addr = $this->_validateRouteAddr($route_addr)) === false) {
                return false;
            }

// Only got addr-spec
        } else {
            // First snip angle brackets if present.
            if (substr($mailbox, 0, 1) == '<' && substr($mailbox, -1) == '>') {
                $addr_spec = substr($mailbox, 1, -1);
            } else {
                $addr_spec = $mailbox;
            }

if (($addr_spec = $this->_validateAddrSpec($addr_spec)) === false) {
                return false;
            }
        }

// Construct the object that will be returned.
        $mbox = new stdClass();

// Add the phrase (even if empty) and comments
        $mbox->personal = $phrase;
        $mbox->comment  = isset($comments) ? $comments : array();

if (isset($route_addr)) {
            $mbox->mailbox = $route_addr['local_part'];
            $mbox->host    = $route_addr['domain'];
            $route_addr['adl'] !== '' ? $mbox->adl = $route_addr['adl'] : '';
        } else {
            $mbox->mailbox = $addr_spec['local_part'];
            $mbox->host    = $addr_spec['domain'];
        }

$mailbox = $mbox;
        return true;
    }

/**
     * This function validates a route-addr which is:
     * route-addr = "<" [route] addr-spec ">"
     *
     * Angle brackets have already been removed at the point of
     * getting to this function.
     *
     * @param string $route_addr The string to check.
     * @return mixed False on failure, or an array containing validated address/route information on success.
     */
    protected function _validateRouteAddr($route_addr)
    {
        // Check for colon.
        if (strpos($route_addr, ':') !== false) {
            $parts = explode(':', $route_addr);
            $route = $this->_splitCheck($parts, ':');
        } else {
            $route = $route_addr;
        }

// If $route is same as $route_addr then the colon was in
        // quotes or brackets or, of course, non existent.
        if ($route === $route_addr){
            unset($route);
            $addr_spec = $route_addr;
            if (($addr_spec = $this->_validateAddrSpec($addr_spec)) === false) {
                return false;
            }
        } else {
            // Validate route part.
            if (($route = $this->_validateRoute($route)) === false) {
                return false;
            }

$addr_spec = substr($route_addr, strlen($route . ':'));

// Validate addr-spec part.
            if (($addr_spec = $this->_validateAddrSpec($addr_spec)) === false) {
                return false;
            }
        }

if (isset($route)) {
            $return['adl'] = $route;
        } else {
            $return['adl'] = '';
        }

$return = array_merge($return, $addr_spec);
        return $return;
    }

/**
     * Function to validate a route, which is:
     * route = 1#("@" domain) ":"
     *
     * @param string $route The string to check.
     * @return mixed False on failure, or the validated $route on success.
     */
    protected function _validateRoute($route)
    {
        // Split on comma.
        $domains = explode(',', trim($route));

foreach ($domains as $domain) {
            $domain = str_replace('@', '', trim($domain));
            if (!$this->_validateDomain($domain)) return false;
        }

return $route;
    }

/**
     * Function to validate a domain, though this is not quite what
     * you expect of a strict internet domain.
     *
     * domain = sub-domain *("." sub-domain)
     *
     * @param string $domain The string to check.
     * @return mixed False on failure, or the validated domain on success.
     */
    protected function _validateDomain($domain)
    {
        // Note the different use of $subdomains and $sub_domains
        $subdomains = explode('.', $domain);

while (count($subdomains) > 0) {
            $sub_domains[] = $this->_splitCheck($subdomains, '.');
            for ($i = 0; $i < $this->index + 1; $i++)
                array_shift($subdomains);
        }

foreach ($sub_domains as $sub_domain) {
            if (!$this->_validateSubdomain(trim($sub_domain)))
                return false;
        }

// Managed to get here, so return input.
        return $domain;
    }

/**
     * Function to validate a subdomain:
     *   subdomain = domain-ref / domain-literal
     *
     * @param string $subdomain The string to check.
     * @return boolean Success or failure.
     */
    protected function _validateSubdomain($subdomain)
    {
        if (preg_match('|^\[(.*)]$|', $subdomain, $arr)){
            if (!$this->_validateDliteral($arr[1])) return false;
        } else {
            if (!$this->_validateAtom($subdomain)) return false;
        }

// Got here, so return successful.
        return true;
    }

/**
     * Function to validate a domain literal:
     *   domain-literal =  "[" *(dtext / quoted-pair) "]"
     *
     * @param string $dliteral The string to check.
     * @return boolean Success or failure.
     */
    protected function _validateDliteral($dliteral)
    {
        return !preg_match('/(.)[][\x0D\\\\]/', $dliteral, $matches) && ((! isset($matches[1])) || $matches[1] != '\\');
    }

/**
     * Function to validate an addr-spec.
     *
     * addr-spec = local-part "@" domain
     *
     * @param string $addr_spec The string to check.
     * @return mixed False on failure, or the validated addr-spec on success.
     */
    protected function _validateAddrSpec($addr_spec)
    {
        $addr_spec = trim($addr_spec);

// Split on @ sign if there is one.
        if (strpos($addr_spec, '@') !== false) {
            $parts      = explode('@', $addr_spec);
            $local_part = $this->_splitCheck($parts, '@');
            $domain     = substr($addr_spec, strlen($local_part . '@'));

// No @ sign so assume the default domain.
        } else {
            $local_part = $addr_spec;
            $domain     = $this->default_domain;
        }

if (($local_part = $this->_validateLocalPart($local_part)) === false) return false;
        if (($domain     = $this->_validateDomain($domain)) === false) return false;

// Got here so return successful.
        return array('local_part' => $local_part, 'domain' => $domain);
    }

/**
     * Function to validate the local part of an address:
     *   local-part = word *("." word)
     *
     * @param string $local_part
     * @return mixed False on failure, or the validated local part on success.
     */
    protected function _validateLocalPart($local_part)
    {
        $parts = explode('.', $local_part);
        $words = array();

// Split the local_part into words.
        while (count($parts) > 0) {
            $words[] = $this->_splitCheck($parts, '.');
            for ($i = 0; $i < $this->index + 1; $i++) {
                array_shift($parts);
            }
        }

// Validate each word.
        foreach ($words as $word) {
            // word cannot be empty (#17317)
            if ($word === '') {
                return false;
            }
            // If this word contains an unquoted space, it is invalid. (6.2.4)
            if (strpos($word, ' ') && $word[0] !== '"')
            {
                return false;
            }

if ($this->_validatePhrase(trim($word)) === false) return false;
        }

// Managed to get here, so return the input.
        return $local_part;
    }

/**
     * Returns an approximate count of how many addresses are in the
     * given string. This is APPROXIMATE as it only splits based on a
     * comma which has no preceding backslash. Could be useful as
     * large amounts of addresses will end up producing *large*
     * structures when used with parseAddressList().
     *
     * @param  string $data Addresses to count
     * @return int          Approximate count
     */
    public function approximateCount($data)
    {
        return count(preg_split('/(?<!\\\\),/', $data));
    }

/**
     * This is a email validating function separate to the rest of the
     * class. It simply validates whether an email is of the common
     * internet form: <user>@<domain>. This can be sufficient for most
     * people. Optional stricter mode can be utilised which restricts
     * mailbox characters allowed to alphanumeric, full stop, hyphen
     * and underscore.
     *
     * @param  string  $data   Address to check
     * @param  boolean $strict Optional stricter mode
     * @return mixed           False if it fails, an indexed array
     *                         username/domain if it matches
     */
    public function isValidInetAddress($data, $strict = false)
    {
        $regex = $strict ? '/^([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})$/i' : '/^([*+!.&#$|\'\\%\/0-9a-z^_`{}=?~:-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})$/i';
        if (preg_match($regex, trim($data), $matches)) {
            return array($matches[1], $matches[2]);
        } else {
            return false;
        }
    }

}

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